What is the VAZ-2109 thermostat , when is it necessary to replace it, what are the main signs of failure, we will describe in this article. And also in our publication contains a detailed description of how to install a more advanced thermostat from a car model 2110. About its advantages will be described below. But starting with the theory, you need to figure out which device the thermostat has, what functions it performs in the cooling system of an internal combustion engine.
What is a thermostat?
As the name of the device itself shows, it does something with temperature. And more specifically, with its help the fluid flows in the cooling system are switched. Moreover, the thermostat, carburetor or injector are the basis of the gasoline injection system, has the same composition and design of the body. When operating any motor, it is necessary to provide heating of the throttle assembly. And it is present in any injection system: both in the carburetor and in the injector.
The basis of any thermostat is a special plate, which is made of a material called bimetal. It reacts to temperature changes and is able to deform due to this. The switching of air flows is based on this effect: the plate moves the valve, which is fixed by springs. Having overcome their force, the plate moves the valve, opening the flow of liquid to the main radiator to ensure effective cooling.
Signs of breakage
What could be the first sign that the VAZ-2109 thermostat is out of order? Of course, the engine overheats even when driving at a high constant speed. The reason is that the liquid continues to circulate in a small circle, not a drop falls into the radiator. And even the inclusion of an electric fan will not help, because doing this is simply useless. The only thing that can slightly correct the situation is opening the faucet of the stove and turning on the interior airflow at maximum speed.
But such an action will not bring comfort in hot weather. The most frequent breakdown of the thermostat is jamming of the sensing element in its original position (the fluid moves in a small circle). If suddenly this happens, then you need to try all the elimination methods. Even a few light strokes on the body may well open the valve. If such an emergency occurred on the road, you will have to drain the liquid, break all the insides of the thermostat so that the liquid circulates only in a large circle. But it will not boil, and you can get to the place of repair.
Replacement Preparation
In order for the car to be completely ready to replace the thermostat, you need to wait until the engine cools down to at least 40-50 degrees. On hot work is extremely dangerous, you can get a burn. The thermostat is being replaced by the VAZ-2109 rather quickly, the most difficult and tedious procedure is emptying the system. To do this, use the two drain holes that are located in the lower part of the radiator (the plug is unscrewed by hand) and in the engine block (bolt under the head 13).
But what to do if the system is filled with antifreeze, which has a rather high cost? We must try to save it so that it would not be expensive to repair the car. To do this, first of all, by opening the faucet of the stove, unscrew the clamp on the pipe that goes to the throttle. Through it, it is necessary to drain the maximum possible amount of antifreeze. Yes, this procedure is slow, but it will allow you to save almost all the fluid. Only after it can you unscrew the cap on the radiator and on the engine block. And do not forget to unscrew the plug on the expansion tank so that the pressure increases.
Thermostat Replacement
Remove the old one, install a new one in its place - this is the whole replacement procedure. But you need to carefully inspect all the nozzles of the system. The thermostat VAZ-2109 is connected. Injector or carburetor in the injection system - it does not matter.
When carrying out work, pay special attention to the clamps. Using old ones is highly undesirable; it is better to install new ones. Moreover, reliability is an important criterion. Worm type clamps are very tender: it is worth making a little more effort, as it collapses. And the possibility of damaging the pipe is very high. If you tighten the clamp excessively, you can break through the rubber. But, of course, it is also impossible to tighten slightly, since leaks of liquid will appear. In other words, it is a double-edged sword. And a little advice: before installation, it is advisable to apply sealant with a thin layer on the surface of the thermostat, which will be in contact with the pipe.
What is the best thermostat with "tens"?
Of course, this is not about those models that were put on the first issues of the "top ten." The VAZ-2109 thermostat (carburetor) is very similar to the one that was installed in the first ten models. But now we are talking about more modern models. Their main advantage is that the number of clamps is minimized. But the thermostat is not mounted to the engine block using a short pipe. The housing is screwed to the engine block using two studs. The temperature sensor is screwed into the thermostat, therefore, the second hole must be turned off.
In addition, when installing the thermostat from "ten" to "nine" there is an opportunity to save a little, because you can only change the sensitive element. Among the passive advantages is the release of space under the hood. The thermostat housing becomes five centimeters shorter, which makes it possible to easily get, for example, to the adjusting nuts of the clutch cable.
Is it possible to install thermostat 2110 on the "nine"?
In part, this question was answered in the last paragraph. Yes, you can install a VAZ-2110 thermostat on 2109, and it does not matter at all whether the "nine" is a carburetor or an injector. In fact, starting with the "eights", the engines are used the same. What can I say, even on modern "Grants" they install an engine that has been used on the "eights" and "nines" since the 80s. Progress, you will not say anything. Of course, instead of a carburetor, there is now a more modern injection system, which, by European standards, was out of date 5-10 years ago. And almost all nodes are interchangeable. There are minor differences, improvements, but this does not change the whole picture.
Cooling system charge
It takes a few minutes to fill the fluid and bleed the cooling system. First of all, check whether all the pipes are securely installed, whether all the clamps are tightened. Then see if the stubs of the engine block and radiator are in place. If not, install them. Now you can open the faucet of the stove and pour liquid into the expansion tank. Stop gurgling - closed the cork and started the engine. Wait until it warms up to operating temperature - about 90 degrees. If necessary, add fluid to the tank. It is necessary that its level be between the lower and upper marks.
Conclusion
There is not much work with the thermostat, but you know very well how to check the VAZ-2109 thermostat. Submerge in boiling water, if the valve opens, then the element is working. It cannot be repaired, only a complete replacement will help. If you want to improve the performance of your engine, then, of course, it is wiser to mount the thermostat from the "tens". True, minor difficulties may arise, for example, the motor will not gain temperature. In this case, it is worth reviewing the connection of system elements. Otherwise, thanks to such modernization, heat transfer only improves.